Post on 21-Dec-2015
Spectrometer Solenoid Fabrication & Testing
Update
Steve VirostekLawrence Berkeley National Lab
MICE CM24 at RAL June 1, 2009
MICE Spectrometer Solenoid Fabrication and Testing Update Page 2
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
MICE Cooling Channel Layout
Spectrometer Solenoid #1 (reassembly under way)
Spectrometer Solenoid #2 (final assembly complete, testing under way)
MICE Spectrometer Solenoid Fabrication and Testing Update Page 3
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
•Magnet cool down•Helium system leak•Current progress•LN cool down system•Temperature logging system•Electronics racks•Tracker go/no go gauge•2nd magnet progress•Upcoming task schedule
Topics
MICE Spectrometer Solenoid Fabrication and Testing Update Page 4
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Helium Cryostat Leak
•Magnet had been completely assembled and cooled to 5K (cold mass) and transfer of LHe was under way
•After an LHe dewar change, the system was not flowing
•Vendor suspected an ice blockage and attempted to thaw out fill line with heated helium gas
•Blockage remained, so vendor attempted to transfer LHe through a vent line
•An internal leak between the cryostat and the insulating vacuum caused the insulating vacuum to fill with helium
•After some disassembly, a leak was found in one of the vent lines (likely at a Conflat seal) and has been repaired
MICE Spectrometer Solenoid Fabrication and Testing Update Page 5
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
LN Cooldown of Magnet
Cooler He lines
Transfer line
MICE Spectrometer Solenoid Fabrication and Testing Update Page 6
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
LHe Transfer into Cold Mass
Fill line turret
Transfer line
Vent line turret
MICE Spectrometer Solenoid Fabrication and Testing Update Page 7
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
LN & LHe Dewars for Cooldown
MICE Spectrometer Solenoid Fabrication and Testing Update Page 8
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Fill and Vent Line Configurations
MICE Spectrometer Solenoid Fabrication and Testing Update Page 9
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Magnet Cross Section View
Fill
Vents
MICE Spectrometer Solenoid Fabrication and Testing Update Page 10
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Fill and Vent Turrets
Normal stinger location
Leak area2nd stinger location
Vacuum
Helium
MICE Spectrometer Solenoid Fabrication and Testing Update Page 11
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Possible Leak Locations
Conflat sealWeld
Weld
MICE Spectrometer Solenoid Fabrication and Testing Update Page 12
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Turret Removal to Access Vent Lines
Upper turret weld
Vent lines
Lower turret weld
MICE Spectrometer Solenoid Fabrication and Testing Update Page 13
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Exposed Vent Lines after Turret Removal
Fill/precool port
Vent line with instrumentation (leak location)
Added vent line
MICE Spectrometer Solenoid Fabrication and Testing Update Page 14
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
FNAL LN Cooldown Control System
Heaters
Thermocouple
Control system chassis
Flow control valve
LN
•System was successfully operated during cooldown
•Modifications to control circuitry needed to optimize performance
MICE Spectrometer Solenoid Fabrication and Testing Update Page 15
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
LN Cooldown Chassis and Heaters
MICE Spectrometer Solenoid Fabrication and Testing Update Page 16
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Temperature Logging System in Use
•System now operating
•16 channels being logged
•User can specify logging time increment
MICE Spectrometer Solenoid Fabrication and Testing Update Page 17
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Temperature Logging System Screen Shot
MICE Spectrometer Solenoid Fabrication and Testing Update Page 18
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Power Supply Racks
•Two power supply racks have arrived at Wang NMR from RAL
•Installation of power supplies and discharge circuits are under way (one rack per magnet)
•Spec supplied by RAL dictates locations of components
•First rack expected to be ready for training of first completed magnet
MICE Spectrometer Solenoid Fabrication and Testing Update Page 19
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Tracker Go/No Go Gauge in Place
Gauge
MICE Spectrometer Solenoid Fabrication and Testing Update Page 20
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
Original First Magnet Cold Mass Assembly
MICE Spectrometer Solenoid Fabrication and Testing Update Page 21
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
70K Shield Connections (1st magnet)
MICE Spectrometer Solenoid Fabrication and Testing Update Page 22
Steve Virostek -- Lawrence Berkeley National Laboratory -- June 1, 2009
•Magnet leak check and re-welding of the vent line turret are to be completed this week
•Cooldown of the magnet could start next week
•FNAL and LBNL are working on a procedure to prevent ice blockages from forming during cooldown
•Magnet cooldown is ~1.5 week process
•System to be run at operating temperature for ~24 hours to ensure recondensing system is functional
•Magnet coils are to be trained prior to warming up for shipping to FNAL (likely mid-July if no other problems)
Upcoming Tasks